Straight edge with rollers and mounting hardware * Adds versatility to your drafting table * Mounting hardware included * Perfect for vellum and paper material About the Mayline Rule II with Metal Rollers This straightedge mounts above the board to aid in your drafting. The rollers let you easily slide your work on the table. * Durable, black phenolic laminate base * Stainless steel rollers to glide smoothly over vellum surface * Transparent blade for see-through registration * Adds versatility to your drafting table or drafting boards * EZ Grip has a raised middle bar for easy movement * Mounting hardware included * Available in a variety of sizes